Bring to Front/ Sent to Back
Modificari Coding Style
Select only if left click.
Fixes to send_to_back/bring_to_front.
Merge branch 'front_back' of
https://github.com/MPS-UPB/Unknown-Revengers.git into front_back

Conflicts:
	src/element_actions/FrontBack.java
Indent enum.
Coding style fixes.
Merge pull request #61 from MPS-UPB/front_back

Bring to Front/ Sent to Back
Fix break elements issue.
Fix coding style.
Merge pull request #63 from MPS-UPB/fix_break

Fix break elements issue.
Merge remote-tracking branch 'origin/develop' into fixes

Conflicts:
	src/element_actions/BlockMouseListener.java
	src/element_actions/ElementActions.java
	src/element_actions/PopupItemListener.java
	src/element_actions/PopupItemMouseListener.java
	src/element_actions/PopupListener.java
	src/gui/GPopup.java